Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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#include "fmt.h"
#include "textcode.h"
#include "str.h"
#include "haveinline.h"
/* src is UTF-8 encoded */
size_t fmt_jsonescape(char* dest,const char* src,size_t len) {
register const unsigned char* s=(const unsigned char*) src;
size_t written=0,i;
char c;
for (i=0; i<len; ++i) {
switch (s[i]) {
case '\\':
case '"':
c=s[i];
escape:
if (dest) {
dest[written]='\\';
dest[written+1]=c;
}
written+=2;
break;
case '\n': c='n'; goto escape;
case '\r': c='r'; goto escape;
case '\b': c='b'; goto escape;
case '\t': c='t'; goto escape;
case '\f': c='f'; goto escape;
default:
if (s[i]<' ') {
if (dest) {
dest[written]='\\';
dest[written+1]='u';
dest[written+2]='0';
dest[written+3]='0';
dest[written+4]=fmt_tohex(s[i]>>4);
dest[written+5]=fmt_tohex(s[i]&0xf);
}
written+=6;
} else {
if (dest) dest[written]=s[i];
++written;
}
break;
}
/* in case someone gives us malicious input */
if (written>((size_t)-1)/2) return (size_t)-1;
}
return written;
}